Received: 12 June 2020
Accepted: 20 August 2020
First Online: 22 September 2020
Ethics approval and consent to participate
: This study protocol was approved by the Ethical Review Board at Osaka University Graduate School of Dentistry (H30-E26) and undertaken with the understanding and written consent of each subject.
: Not applicable
: Toshihito Takahashi, Kazunori Nozaki, Tomoya Gonda, Tomoaki Mameno, Masahiro Wada, and Kazunori Ikebe declare that they have no competing interests.